added info of the required input

main.py

@@ -10,10 +10,10 @@ from Functions_output import *
 
 import sys
 if not(len(sys.argv)>=4) :# intersect, gfa, pos_seg (target_genome_name)
-        print("expected input : intersect, gfa file  with walks, bed file with positions of the segments on the target genome")
+        print("expected input : intersect, gfa file  with walks, bed file with positions of the segments on the target genome, and the name of the walk of the target genome")
         sys.exit(1)
 elif (sys.argv[1]=="-h") :
-    print("expected input : intersect, gfa file  with walks, bed file with positions of the segments on the target genome")
+    print("expected input : intersect, gfa file  with walks, bed file with positions of the segments on the target genome, and the name of the walk of the target genome")
     print("output : graph gff, graph gaf, target genome gff+variations")
     sys.exit(1)